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Property, Plant, and Equipment (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gains (losses) on disposals of property, plant and equipment |  | $ (17) |
Property, plant and equipment expenditures | $ 486 | 417 | $ 277
Interest costs capitalised | $ 8 | $ 6 | $ 2
Capitalisation rate of borrowing costs eligible for capitalisation | 6.00% | 5.90% |
Windrise Wind Facility |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment expenditures | $ 156 |  |
WindCharger Battery Storage Project |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment expenditures | 6 |  |
Kaybob Cogeneration Facility |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment expenditures | 31 |  |
Centralia Coal Mine |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment expenditures | 17 |  |
Pioneer Pipeline |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Other cash and cash equivalents |  | $ 15 |
Genesee Unit 3 |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Additions |  | 5 |
Keephills 3 |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Additions |  | 308 |
Coal generation | Keephills 3 |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Additions |  | 300 |
Mining property and equipment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Gains (losses) on disposals of property, plant and equipment |  | (18) |
Gross carrying amount |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Additions | 486 | 522 |
Property, plant and equipment expenditures |  | 417 |
Gross carrying amount | US Wind Projects |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment expenditures |  | 169 |
Gross carrying amount | Pioneer Pipeline |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment expenditures |  | 100 |
Gross carrying amount | Coal generation |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Additions | 0 | 0 |
Gross carrying amount | Mining property and equipment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Additions | 0 | 0 |
Gross carrying amount | Gas generation |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Additions | 0 | $ 0 |
Property, plant and equipment expenditures | $ 93 |  |

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The weighted average of interest and other costs that an entity incurs in connection with the borrowing of funds applicable to the borrowings of the entity that are outstanding during the period, other than borrowings made specifically for the purpose of obtaining a qualifying asset. [Refer: Weighted average [member]; Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2019-01-01 -Paragraph 26 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=23&code=ifrs-tx-2019-en-r&anchor=para_26_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The gains (losses) on disposals of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 98 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_98_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of cash and cash equivalents that the entity does not separately disclose in the same statement or note. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The cash outflow for the purchases of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_16_a&doctype=Standard -URIDate 2019-03-27 + Details
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